United Kingdom (UK) Online Retailing Market Size, Segment Analysis, Drivers and Constraints, Trends and Forecast to 2028 . The UK online retailing market size was GBP123.05 billion in 2023. The market will yield a CAGR of more than 4% during 2023-2028. To capitalize on the increased online demand, retailers must ensure that websites are optimized to guarantee that shoppers, who prioritize purchase speed, easily find what they need and check out quickly. For more details visit: